.err{
    text-align: center;
    line-height: 1rem;
}
.err img{
    max-width: 100%;
}
.err p{
    color:#999;
}
.err a{
    display: inline-block;
    width: 2rem;
    height: 0.8rem;
    color: #fff;
    font-size: .3rem;
    border: 0.05rem solid #999;
    line-height: 0.8rem;
    border-radius: 0.2rem;
    text-decoration: none;
}